Exchange anisotropy and the antiferromagnetic surface order parameter
نویسندگان
چکیده
The temperature dependence of the exchange bias (HE) near the FeF 2 Néel temperature (; 78.4 K! was correlated with structural measurements in FeF2-Fe bilayers. Low-angle x-ray diffraction and atomic force microscopy show that samples with larger height fluctuations have larger lateral grain sizes. Samples with larger lateral grain sizes exhibit a surface critical exponent (bS;0.8) while samples with smaller grains and smaller height fluctuations have a decreased bS , indicating a more three-dimensional-like phase transition or an increase in the FeF 2 surface exchange interaction. @S0163-1829~97!05230-2#
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